A collection of 1344 topographic
map sheets created by the U.S. Army Corps of Engineers from 1894 to 1945
that covers the continental United States, Puerto Rico, the Virgin Islands,
and the Panama Canal Area. The maps illustrate tactical and geographic
features, such as military bases, landing strips, transportation networks,
communication centers, and topography. The maps are labeled in one of three
ways: Tactical, Progressive and Strategic. Tactical maps are the most
detailed and contain firing grids for artillery. Some of the maps are
stamped "restricted" but are no longer classified.